The commit 337b1b566db0 ("PCI: Fix restoring BARs on BAR resize
rollback path") added BAR rollback to
pci_do_resource_release_and_resize() in case of resize failure.

On the rollback, pci_claim_resource() is called which can fail and the
code is prepared for that possibility. pci_claim_resource()'s return
value, however, overwrites the original value of ret so
pci_claim_resource() will return incorrect value in the end (as
pci_claim_resource() normally succeeds, in practice ret will be 0).

Fix the issue by directly calling pci_claim_resource() inside the if ().

Fixes: 337b1b566db0 ("PCI: Fix restoring BARs on BAR resize rollback path")
Link: https://lore.kernel.org/linux-pci/aW_w1oFQCzUxGYtu@intel.com/
Cc: stable@vger.kernel.org
Reported-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
---
 drivers/pci/setup-bus.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index 6e90f46f52af..9c374feafc77 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -2556,8 +2556,7 @@ int pci_do_resource_release_and_resize(struct pci_dev *pdev, int resno, int size
 
 		restore_dev_resource(dev_res);
 
-		ret = pci_claim_resource(dev, i);
-		if (ret)
+		if (pci_claim_resource(dev, i))
 			continue;
 
 		if (i < PCI_BRIDGE_RESOURCES) {
-- 
2.39.5

On Wed, 21 Jan 2026, Ilpo Järvinen wrote:

> The commit 337b1b566db0 ("PCI: Fix restoring BARs on BAR resize
> rollback path") added BAR rollback to
> pci_do_resource_release_and_resize() in case of resize failure.
> 
> On the rollback, pci_claim_resource() is called which can fail and the
> code is prepared for that possibility. pci_claim_resource()'s return
> value, however, overwrites the original value of ret so
> pci_claim_resource() will return incorrect value in the end (as

Hi Bjorn,

I noticed this should have been:

"pci_do_resource_release_and_resize() will return incorrect value in the 
end ..."

(used a wrong function name).

Could you please adjust the commit message in your tree if it's not too 
late yet?

I'm sorry about the extra hassle.

--
 i.

> pci_claim_resource() normally succeeds, in practice ret will be 0).
> 
> Fix the issue by directly calling pci_claim_resource() inside the if ().
> 
> Fixes: 337b1b566db0 ("PCI: Fix restoring BARs on BAR resize rollback path")
> Link: https://lore.kernel.org/linux-pci/aW_w1oFQCzUxGYtu@intel.com/
> Cc: stable@vger.kernel.org
> Reported-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
> ---
>  drivers/pci/setup-bus.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
> index 6e90f46f52af..9c374feafc77 100644
> --- a/drivers/pci/setup-bus.c
> +++ b/drivers/pci/setup-bus.c
> @@ -2556,8 +2556,7 @@ int pci_do_resource_release_and_resize(struct pci_dev *pdev, int resno, int size
>  
>  		restore_dev_resource(dev_res);
>  
> -		ret = pci_claim_resource(dev, i);
> -		if (ret)
> +		if (pci_claim_resource(dev, i))
>  			continue;
>  
>  		if (i < PCI_BRIDGE_RESOURCES) {
> 

On Thu, Jan 22, 2026 at 12:07:40PM +0200, Ilpo Järvinen wrote:
> On Wed, 21 Jan 2026, Ilpo Järvinen wrote:
> 
> > The commit 337b1b566db0 ("PCI: Fix restoring BARs on BAR resize
> > rollback path") added BAR rollback to
> > pci_do_resource_release_and_resize() in case of resize failure.
> > 
> > On the rollback, pci_claim_resource() is called which can fail and the
> > code is prepared for that possibility. pci_claim_resource()'s return
> > value, however, overwrites the original value of ret so
> > pci_claim_resource() will return incorrect value in the end (as
> 
> Hi Bjorn,
> 
> I noticed this should have been:
> 
> "pci_do_resource_release_and_resize() will return incorrect value in the 
> end ..."
> 
> (used a wrong function name).
> 
> Could you please adjust the commit message in your tree if it's not too 
> late yet?

Updated, thanks!